Warp-stop-motion mechanism for looms.



? NiTEb STATS ATENT FFiCE.

WILLIAM E. ALLEN, OF SALEM, MASSACHUSETTS, ASSIGNOR TO DRAPER COMPANY,OF PORTLAND, MAINE, AND HOPEDALE, MASSACHUSETTS.

WARP*STOP-MOTION MECHANISM FOR LOOMS.

SPECFIATIN formng part of Letters Patent N 0. 669,472, dated March 5,1901.

Application filed August 25, 1900. berialNo. 27,987. (No modal.)

Be it known that I, WILLIAM E. ALLEN, a citizen of the United Statos,residing at Salem, in the county of Essex and State of Massachusetts,have inventod an Improvement in Warp-Stop-Motion Mechanism for Looms, ofwhioh the following description, in connection with the accompanyingdrawings, is a spocification, like letters on the drawings represontinglike parts.

This invention relates to warp-stop-motion mechanism of the type whereinsuitabio stopping means is controlled as to its oporation by or throughdetectors Which are normally held in inoperativo position by thewarpthreads, breakage of a warp-thread releasing its detector andpormitting it to move into operative position.

In practice it has boon found that sonnetimos the stopping moans will beoperated unnecessarilyby a s1ack warp-thread, the

slackness whiie not interfering With the proper action of the apparatus,suoh as a 100m, being sufficient to permit movement of the dotector intooperative position. Manifestly it is undosirablo to stop the apparatusunloss a warp-thread breaks or a very abnormal slackness of throadocours; and my prosent invention has for its object the production ofmeans for preventing movoment of a detector into operative positionunless its warpthread breaks, so that slack throad will not underordinary circumstances affect the operation of the apparatns.

Figure lis a sufficient view of a portion of a 100m to be undorstoodWith one embodiment of my invention applied thereto. 2 is a detailshowing the position assumod by a detoctor when its warp-thread breaks,and Fig. 3 shows another form of detector to be doscribed.

I have herein shown my invention as illustratod in connection with a100m as affording a wide field for its application; but my invention isnot rostrioted to such use or application.

In Fig. 1 the harnesses H H, leaso-rods L L, and whip-roll W are and maybe of usual or well-known construction in looms, and, as hereinillustrated, I have applied the detoctors of the warp-stop-motionmeohanism to Figthe warp-throads botwoen the whip-roll and theloase-rods. A warp-rest (shown as a bar a) is oxtended across the 100mbeneath the warp-threads, and a serios of stop-motion dotoctors (1 areprovidod, each ongaging a warpthread in a plurality et places, thedetector being shown as substantially Y-shaped, divergent arms d dbranching from the upper end of the depending shank or body d. Each artnis provided with a warp-engaging portion, as the eye d and the arms ofeach dotector straddle the warp-rest a, the thread passing through theeye of the arm d, over the warp-rost, and then throngh the eye of thearm (1 S0 long as the warp-threads are intact the dotectors will bemaintained thoraby in inoperative position, with their iower onde out ofthe path of movement of a normally vibrating feolerf, mounted on ar1nsf, seoured to a rock-shaftf, mounted in suitablo bearings (not shwn) onthe loomrame. Shonld a thread break, its detector will doscend intooporative position, (see Fig. 2,) the detector d being thus shown, andthe feolor will be engaged and arrostod thoroby, a guide g at snob timeserving as a back-stop for the shank of the detector.

The feoler may be vibratod in any suitablo manner-as, for instance, bythe mechanism shown in Unitod Statos Patent No. 622,182, dated Maroh 29,l899arrost of the feeler acting by suitable intermediato devicos (nothorein shown) to effect the operation of the stopping means, theshipper-lever S, Fig. 1, boing the only membor of the stopping meansherein illustratod.

In Figs. 1 and 2 the shank of the dotoctor is longitudinally siottod atd to recoivo a fixed support d which guides the detoctors and preventsthem from itnproper displacoment Wheu released by a broken warp-throad.

Should a thread become slaok, it will pormit some descent of thedetector, but by the double engagement of the latter with the thread andthe coperating warp-rest a the downward movement of the detector willnot be suffioient to place it in the feeler-path. Hence for ordinary andallowable siackness of a warp-throad the stopping means will not beoperatod. On the other hand, if a thread breaks, as at w Fig. 2, thewarp-rest doos IOO not in any way hinder themovement of the detectordirectly into operative position to engage the feeler and e1ect theoperation of the stopping means.

The detectors may be made of thin fiat shoot metal, as shown in Figs. 1and 2, stamped or ont ont, 01 they may be made of wire, as shown in Fig.3, the wire being twisted upon itself, as at h, to form a rigid body orshank and having its ends diverge, as at h h each end having an opendownturned hook h to hook over the warp-thread.

Back and front guides g g are provided, between which the shanks of thedetectors are extended, the back guide 9' having an opening g thereinopposite the feelerf and into which the latter extends on its feelingstroke.

When a thread breaks, its detector drops the shank crossing the opening9 and engages the feeler on its next feeling stroke, so that thestopping means W111 be operated, the guide supporting the shank aboveand below the feeler opening and taking up any strain due to arrestingthe feeler.

My invention is not restricted to the precise construction andarrangement herein shown and described, as the same may be modifiedwithout departing from the spirit and scope of my invention.

Having described my invention, what I claim as new, and desire to seoureby Letters Patent, is

1. In apparatus of the class described, a transverse warp-rest, a seriesof Y-shaped detectors provided with a warp-engaging portion in eachbranch, the bifurc'ated npper and of the detector straddiing the rest,whereby each detector engages its thread above and at opposite sides ofthe rest, a normalIy vibrating feeler t0 engage the straight, dependingshank of a detector released by breakage of its warp-thread, andstopping means operated by or through engagement of the feeler with theshank of a released detector.

2. In apparatns of the class described, a series of verticaily-movablethin, fiat detectors each having a depending, straight shank bifurcatedat its upper end and adapted to engage a warp-thread at two points, awarprest extended beneath the warps and between the bifiurcations of thedetectors, the latter being maintained in inoperaiive position by intactthreads, a normaliy vibrating feeler t0 coperate with the shank of areleased detector, and stopping means operated by or through engagementof the ieeler with the depending portion of a released detector.

3. In apparatus of the class described, a series of Y-shaped detectorshaving a warpeye in each divergent branch, and a straight, elongatedshank depending from the apex of the branches, a warp-rest extendedbeneath the warps between the branches of each detector, a fixed guideadjacent the depending shank of each detector, a feeler normally vibrating toward and from the guide, and stopping means eontrolled by thefeeler, the shank of a released detector, due to breakage of itswarp-thread, being engaged by and arresting the feeler and supported bythe guide, such arrest of the feeler efiecting the aetuation of thestopping means.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WILLIAM E. ALLEN.

Witnesses:

JOHN C. EDWARDS, MARGARET A. DUNN.

